Three different rounds of severe weather occurred between the afternoon of June 4th and the evening of June 5th.  The second round of severe weather occurred during the late evening on June 4th through the early morning hours on June 5th.  Clusters of severe thunderstorms, producing mainly large hail and damaging winds, crossed most of South-Central and Southeast Wisconsin.  Golf-ball sized hail (1.75 inches) was measured at a location 3 miles east of Delavan at 2210CST and 1 mile west of Kenosha at 0315CST.  Damaging winds caused tree and power line damage across Lafayette, Sauk, Iowa, Green, and Fond du Lac counties.  A pontoon boat was overturned in Lafayette County which caused $5,000 in damage.  Synoptically, an area of low pressure tracked across eastern South Dakota on June 4th and into northern Minnesota by late evening on June 5th.  A warm front surged north across South-Central and Southeast Wisconsin during the evening on June 4th, causing thunderstorms to develop.  The warm front stalled for a bit during the early morning hours on June 5th, allowing another round to develop and head east across the area.  Finally, the warm front pushed into northern Wisconsin, allowing warm and humid air to flood into the region, fueling the final round along the cold front by late afternoon or early evening on June 5th.

Hail in JEFFERSON, WISCONSIN
From 05-JUN-05 00:54:00 to 05-JUN-05 00:54:00 (CST)
Location: LAKE MILLS
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Thunderstorm Wind in GREEN, WISCONSIN
From 05-JUN-05 00:04:00 to 05-JUN-05 00:04:00 (CST)
Location: NEW GLARUS
Magnitude: 52 EG
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in GREEN, WISCONSIN
From 04-JUN-05 23:46:00 to 05-JUN-05 00:00:00 (CST)
Location: BROWNTOWN
Magnitude: 56 EG
Property damage: 5K
Reported by: LAW ENFORCEMENT

Trees and powerlines down.

Thunderstorm Wind in IOWA, WISCONSIN
From 04-JUN-05 23:50:00 to 04-JUN-05 23:50:00 (CST)
Location: DODGEVILLE
Magnitude: 65 EG
Property damage: 10K
Reported by: LAW ENFORCEMENT

Powerpoles down on Highway 18.

Thunderstorm Wind in LAFAYETTE, WISCONSIN
From 04-JUN-05 23:55:00 to 04-JUN-05 23:55:00 (CST)
Location: ARGYLE
Magnitude: 52 EG
Reported by: LAW ENFORCEMENT

Hail in WALWORTH, WISCONSIN
From 04-JUN-05 22:35:00 to 04-JUN-05 22:35:00 (CST)
Location: HONEY CREEK
Magnitude: 0.75 
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in COLUMBIA, WISCONSIN
From 05-JUN-05 00:19:00 to 05-JUN-05 00:19:00 (CST)
Location: LODI
Magnitude: 50 MG
Reported by: AWOS,ASOS,MESONET,ETC

Measured at Lodi Middle School.

Thunderstorm Wind in SAUK, WISCONSIN
From 05-JUN-05 00:00:00 to 05-JUN-05 00:00:00 (CST)
Location: SPRING GREEN
Magnitude: 65 EG
Property damage: 50K
Reported by: LAW ENFORCEMENT

Numerous large trees were toppled along with power lines.

Thunderstorm Wind in LAFAYETTE, WISCONSIN
From 04-JUN-05 23:25:00 to 04-JUN-05 23:40:00 (CST)
Location: BENTON
Magnitude: 56 EG
Property damage: 5K
Reported by: LAW ENFORCEMENT

Pontoon boat overturned.

Hail in MILWAUKEE, WISCONSIN
From 04-JUN-05 22:29:00 to 04-JUN-05 22:29:00 (CST)
Location: WEST ALLIS
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Hail in KENOSHA, WISCONSIN
From 05-JUN-05 03:15:00 to 05-JUN-05 03:15:00 (CST)
Location: KENOSHA
Magnitude: 1.75 
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in SAUK, WISCONSIN
From 05-JUN-05 00:10:00 to 05-JUN-05 00:35:00 (CST)
Location: HILLPT
Magnitude: 65 EG
Property damage: 20K
Reported by: LAW ENFORCEMENT

Some large trees and power lines were knocked down.

Hail in WALWORTH, WISCONSIN
From 04-JUN-05 22:10:00 to 04-JUN-05 22:10:00 (CST)
Location: DELAVAN
Magnitude: 1.75 
Reported by: AMATEUR RADIO

Hail in RACINE, WISCONSIN
From 04-JUN-05 22:38:00 to 04-JUN-05 22:38:00 (CST)
Location: WATERFORD
Magnitude: 0.88 
Reported by: LAW ENFORCEMENT

Hail in ROCK, WISCONSIN
From 05-JUN-05 01:06:00 to 05-JUN-05 01:06:00 (CST)
Location: JANESVILLE
Magnitude: 0.88 
Reported by: TRAINED SPOTTER